TY - CHAP TI - Textiles Nanotechnology AU - Pourdeyhimi, B. AU - Fedorova, N. AU - Dondero, William AU - Gorga, Russell E. AU - Michielsen, Stephen AU - Ghosh, Tushar AU - Chhaparwal, Saurabh AU - Barrera, Carola AU - Rinaldi, Carlos AU - Satcher, Melinda AU - Hinestroza, Juan P. T2 - Handbook of Nanoscience, Engineering, and Technology A2 - Goddard, William A., III A2 - Brenner, Donald W. A2 - Lyshevski, Sergey E. A2 - Iafrate, Gerald J. PY - 2007/// ET - 2nd PB - CRC Press SN - 0849375630;9780849375637 ER - TY - CONF TI - Effects of oxygen plasma treatment on adipose-derived adult stem cell adherence AU - Hanson, A.D. AU - Wall, M.E. AU - Pourdeyhimi, B. AU - Loboa, E.G. T2 - Annual Meeting of the Biomedical Engineering Society C2 - 2007/9// C3 - Proceedings of the Annual Meeting of the Biomedical Engineering Society CY - Los Angeles, CA DA - 2007/9// PY - 2007/9// ER - TY - CONF TI - Associative polymer facilitated electrospinning of nanofibers: role of viscoelasticity AU - Talwar, S. AU - Hinestroza, J. AU - Pourdeyhimi, B. AU - Khan, S.A. T2 - Society of Rheology meeting C2 - 2007/10// CY - Salt Lake City, Utah DA - 2007/10// PY - 2007/10// ER - TY - CHAP TI - Characterization, testing and Modeling of Nonwovens AU - Pourdeyhimi, B. T2 - Handbook of Nonwovens A2 - Russell, S.J. PY - 2007/// PB - CRC Press SN - 9781855736030 9781845691998 ER - TY - JOUR TI - Effect of cellulase pretreatment of raw and bleached cotton fibers on properties of hydroentangled nonwoven fabrics AU - Verenich, S. AU - Arumugam, K. AU - Shim, E. AU - Pourdeyhimi, B. T2 - Journal of Applied Polymer Science AB - Abstract This study was undertaken to investigate the effect of enzymatic pretreatment of cotton (polysaccharides) fibers on the properties of resulting nonwoven fabric. Enzymatic treatment is known to improve the esthetical properties of fabrics but will likely lead to a reduction in strength. In the case of nonwovens the strength loss can be even more drastic as cellulase may attack bonded areas of the fabric. In this work, raw and bleached cotton fibers were treated with enzyme solutions prior to fabric formation to avoid possible damage to the bonded areas and improve strength retention. These fibers were first modified with commercially available whole cellulases and monocomponent endoglucanase enzyme solutions. Then they were formed into a fabric and bonded via hydroentangling. Parameters such as bending modulus, fabric tenacity, fiber strength, length and reducing power were measured for each sample. The pretreatment of cotton fibers prior to fabric formation showed that the resulting nonwovens could be stronger and more drapeable than the same fabric composed of untreated fibers. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007 DA - 2007/// PY - 2007/// DO - 10.1002/app.26158 VL - 105 IS - 2 SP - 492-499 J2 - J. Appl. Polym. Sci. LA - en OP - SN - 0021-8995 1097-4628 UR - http://dx.doi.org/10.1002/app.26158 DB - Crossref KW - enzymes KW - polysaccharides KW - fibers KW - mechanical properties KW - structure-property relations ER - TY - JOUR TI - novel polymer composite with double positive-temperature-coefficient transitions: Effect of filler-matrix interface on the resistivity-temperature behavior AU - Zhang, X. AU - Pan, Y. T2 - Polymer International DA - 2007/// PY - 2007/// VL - 57 ER - TY - CONF TI - Unique Nanofiber Structures for Filtration Applications C2 - 2007/11// C3 - MemFAST Meeting DA - 2007/11// ER - TY - CONF TI - Polyacrylonitrile-Based Composite and Carbon Nanofibers for Lithium-Ion Battery Applications C2 - 2007/10// C3 - 212th Electrochemical Society Meeting DA - 2007/10// ER - TY - CONF TI - Nonwovens Containing Polymer Fillers C2 - 2007/11// C3 - TE/ECE Symposium DA - 2007/11// ER - TY - CONF TI - Nonwovens Containing Polymer Fillers C2 - 2007/11// C3 - MemFAST Meeting DA - 2007/11// ER - TY - CONF TI - Electrospinning Parameters and Their Effect on the Fabrication of Catalyst-Loaded Nanofibers for Fuel Cells C2 - 2007/11// C3 - 3rd Annual State of North Carolina Undergraduate Research Symposium, DA - 2007/11// ER - TY - JOUR TI - Strategic analysis of speed and flexibility in sourcing textile products AU - Hartman, Lisa M DA - 2007/// PY - 2007/// ER - TY - CONF TI - AC 2007-3009: COMPUTER-BASED MODELING FOR ENGINEERS USING EXCEL AND VBA AU - Roberts, Stephen C2 - 2007/// C3 - 2007 ASEE DA - 2007/// VL - 12 SP - 1 ER - TY - CONF TI - Computer-Based Modeling for Engineers using Excel and VBA AU - Joines, J.A. AU - Roberts, S. AU - Raubenheimer, D. C2 - 2007/// C3 - Proceedings of the ASEE International Conference DA - 2007/// UR - http://www.asee.org/acPapers/code/getPaper.cfm?paperID=13338 ER - TY - CONF TI - A Comparison Meta-Heuristics for Large Scale Facility Location Problems with Economies of Scale AU - Bucci, M.G. AU - Kay, M.G. AU - Warsing, D.P. AU - Joines, J.A. C2 - 2007/// C3 - Proceedings of the Industrial Engineering Research Conference DA - 2007/// ER - TY - JOUR TI - Skin pressure profiles and variations with body postural changes beneath medical elastic compression stockings AU - Liu, Rong AU - Kwok, Yi Lin AU - Li, Yi AU - Lao, Terence T. AU - Zhang, Xin T2 - INTERNATIONAL JOURNAL OF DERMATOLOGY AB - Medical elastic compression stockings (GCSs) are one of the most widely used mechanical compression approaches to relieve venous disorders of the lower limb. The skin pressure profiles applied by compression stockings may be altered with body postural changes, thus exerting influences on their therapeutic efficiency.To examine and quantify objectively the skin pressure distribution and magnitude beneath GCSs with body postural changes, and to analyze the possible reasons for skin pressure variations.The pressure levels of four different kinds of commonly used GCS were measured using piezoelectric sensors and a multichannel measuring system in six female healthy volunteers in 10 different body positions.Body postural changes significantly influenced the skin pressure profiles (P < 0.001). Skin pressures at the ankle and on the anterior side of the leg were always highest when tested in all positions. Extension and flexion of the knee joint significantly influenced the skin pressure at the anterior and posterior aspects of the leg, especially when tested in the sitting position with the knee flexed at 90 degrees and in the supine position with the knee flexed at more than 90 degrees (P < 0.001). Plantar flexion of the ankle joint, such as up-heel standing and heel-off walking, significantly increased the skin pressure in the ankle region. Contraction, extension, and relaxation of the calf muscle did not produce large fluctuations in skin pressure when tested in positions with full knee extension.Body postures may be one of the most important factors influencing the skin pressure profiles applied by compression stockings. The anatomic structure of individual legs, the special design of compression stockings, and the physical properties of stocking materials also influence skin pressure variations at different tested locations in different body positions. Appropriate leg postural changes and exercise may improve the therapeutic effectiveness of GCSs. DA - 2007/5// PY - 2007/5// DO - 10.1111/j.1365-4632.2007.03175.x VL - 46 IS - 5 SP - 514-523 SN - 0011-9059 UR - https://publons.com/publon/8072788/ ER - TY - CONF TI - Sustainabilility - just a PR gimmick? AU - Boyter, H. C2 - 2007/// C3 - Fashion garment washing: trends, fabrics, technologies & sustainability : AATCC symposium ; December 12 - 13, 2007, Renaissance Hotel, Long Beach, California DA - 2007/// PB - Research Triangle Park, NC: AATCC ER - TY - CHAP TI - Management of quality and business statistics AU - Godfrey, A. B. AU - Leon, R. T2 - Encyclopedia of statistics in quality and reliability A2 - F. Ruggeri, R. S. Kenett A2 - Faltin, F W. PY - 2007/// PB - Chichester, England: John Wiley SN - 9780470018613 ER - TY - CHAP TI - Six Sigma AU - Godfrey, A. B. T2 - Encyclopedia of statistics in quality and reliability A2 - F. Ruggeri, R. S. Kenett A2 - Faltin, F. W. PY - 2007/// SP - 1825-1830 PB - Chichester, England: John Wiley SN - 9780470018613 ER - TY - CONF TI - Opportunities for cotton AU - Pourdeyhimi, B. C2 - 2007/// C3 - Beltwide Cotton Conferences. Proceedings DA - 2007/// ER - TY - CONF TI - Niche marketing strategy in the textile and apparel industry: an investigation into development factors AU - Allen R., Parrish E.D. AU - Cassill N.L., Oxenham W. AU - M.R., Jones C2 - 2007/// DA - 2007/// SP - 239-256 ER - TY - CONF TI - High performance nonwovens AU - Pourdeyhimi, B. C2 - 2007/// C3 - Beltwide Cotton Conferences. Proceedings DA - 2007/// ER - TY - CONF TI - Future directions in nonwovens technologies AU - Pourdeyhimi, B. C2 - 2007/// C3 - Beltwide Cotton Conferences. Proceedings DA - 2007/// ER - TY - CHAP TI - Error proofing, healthcare AU - Nakajo, T. AU - Clapp, T. G. AU - Blanton, G. A. T2 - Encyclopedia of statistics in quality and reliability A2 - Ruggeri, R. S. Kenett F. A2 - Faltin, F. W. AB - Abstract Many error proofing solutions are implemented successfully in healthcare. Most of them, however, are generated individually without the benefit of the knowledge of the wider body of error‐proofing solutions in related healthcare areas. Almost no healthcare organization has the benefit of the extensive experience in error proofing in manufacturing industries or other service industries. This article provides a simple methodology for applying error proofing principles and proven healthcare solutions for systematically generating workable solutions to reduce human error. PY - 2007/// DO - 10.1002/9780470061572.eqr409 PB - Chichester, England: John Wiley SN - 9780470018613 ER - TY - CHAP TI - Cost of quality AU - Godfrey, A. B. T2 - Encyclopedia of statistics in quality and reliability A2 - F. Ruggeri, R. S. Kenett A2 - Faltin, F. W. PY - 2007/// SP - 446-450 PB - Chichester, England: John Wiley SN - 9780470018613 ER - TY - JOUR TI - Environmental legislation USA AU - Boyter, H. A. T2 - ENVIRONMENTAL ASPECTS OF TEXTILE DYEING DA - 2007/// PY - 2007/// DO - 10.1533/9781845693091.30 IS - 66 SP - 30-43 SN - 2042-0803 ER - TY - JOUR TI - Turkish towel's place in the global market AU - Yilmaz, N. AU - Cassill, L. AU - Powell, N. T2 - Journal of Textile and Apparel Technology and Management DA - 2007/// PY - 2007/// VL - 5 IS - 4 ER - TY - JOUR TI - Global dynamics impacting yarn production and consumption AU - Tangboonritruthai S., Cassill N. L. AU - W., Oxenham T2 - Journal of Textile and Apparel Technology and Management DA - 2007/// PY - 2007/// VL - 5 IS - 4 SP - 1-26 ER - TY - JOUR TI - An examination of the economic and social benefits from us textile industry strategic partnerships AU - Divita, L. AU - Ludwig, D. AU - Cassill, N. T2 - Journal of Textile and Apparel Technology and Management DA - 2007/// PY - 2007/// VL - 5 IS - 3 ER - TY - JOUR TI - A study on the role of hydroentangling waterjets in reorienting fibers in nonwoven fabrics AU - Anantharamaiah, N. AU - Rompert, K. AU - Vahedi Tafreshi, H. AU - Pourdeyhimi, B. T2 - Journal of Materials Science DA - 2007/// PY - 2007/// VL - 42 SP - 6161-6170 ER - TY - JOUR TI - 3-D simulation and analysis of nonwoven structures AU - Pourdeyhimi, B. AU - Tafreshi, H. V. AU - Maze, B. T2 - Journal of Engineered Fibers and Fabrics DA - 2007/// PY - 2007/// VL - 1 IS - 2 SP - 47-52 ER - TY - JOUR TI - Strength optimization of thermally bonded spunbond nonwovens AU - Fedorova, N. AU - Verenich, S. AU - Pourdeyhimi, B. T2 - Journal of Engineered Fibers and Fabrics DA - 2007/// PY - 2007/// VL - 2 IS - 1 SP - 38-48 ER - TY - JOUR TI - Formation of fiberwebs from staple fibers with controlled fiber orientation using electrostatic forces: Theoretical analysis AU - Cai, Y. Y. AU - Seyam, A. M. AU - Kim, Y. K. T2 - Journal of Engineered Fibers and Fabrics DA - 2007/// PY - 2007/// VL - 2 IS - 2 SP - 17-24 ER - TY - PAT TI - Hydroentangling jet strip device defining an orifice AU - Pourdeyhimi, Behnam AU - Tafreshi, H. C2 - 2007/// DA - 2007/// PY - 2007/// ER - TY - JOUR TI - Pretreatment of bleached cotton fibers with whole and Monocomponent cellulases for nonwoven applications AU - Arumugam, K. AU - Verenich, S. AU - Shim, Eunkyoung AU - POURDEYHIMI, BEHNAM T2 - Textile Research Journal AB - Enzymatic treatment of fabrics has been carried out in the past to enhance the aesthetic properties, which has often resulted in the reduction of fabric strength. The objective of the current investigation was to develop process recipes for the production of soft and strong nonwoven fabric from enzymatically treated cotton fibers. Two different enzymatic solutions, the whole cellulase and Cellulose Binding Domain (CBD)-free monocomponent endoglucanase, were selected for this purpose. The latter was used as potential enzyme solution that could reduce the fiber strength loss during hydrolysis. This paper discusses the changes in reducing power, protein adsorption, surface properties and single fiber tenacity of bleached cotton fibers and compares with those obtained with raw cotton treated at identical conditions. The results observed in this study showed that bleached cotton was less susceptible to damage and weakening than raw cotton fibers. Thus, the aggressive whole cellulase is more suitable for treatment of bleached cotton fibers, whereas CBDfree endoglucanase is sufficient for treatment of raw cotton fibers. DA - 2007/// PY - 2007/// DO - 10.1177/0040517507078807 VL - 77 IS - 10 SP - 734–742 ER - TY - JOUR TI - The Lumber Procurement and Kiln Scheduling Problem: A Hybrid-GA Approach AU - Joines, J.A. AU - Culbreth, C.T. AU - Schultz, S. T2 - Wood and Fiber Science DA - 2007/// PY - 2007/// VL - 39 IS - 4 SP - 628-638 ER - TY - JOUR TI - Simulating permeability of 3-D calendered fibrous structures AU - Zobel, S. AU - Maze, B. AU - Tafreshi, H. Vahedi AU - Wang, Q. AU - Pourdeyhimi, B. T2 - CHEMICAL ENGINEERING SCIENCE AB - Many fibrous materials such as nonwoven materials are often consolidated by means of hot calenders, i.e., hot compaction rolls. Hot calendering compresses the fiber assembly and can cause changes in the structure. In nonwovens, calendering has an added function of thermally bonding the fibers at their respective crossovers to form a strong but yet somewhat porous material. Calendering causes a significant increase in the solid volume fraction (SVF) of the media and therefore, affects their permeability. To our knowledge, no work in the literature has been dedicated to modeling the permeability of calendered nonwovens. In this study, virtual nonwoven structures are generated and compressed from top and bottom to resemble the hot calendering process. In agreement with our experimental observations, it was found that the average SVF profile across the material's thickness turns into a U-shape profile after the calendering. In this work, the dimensionless permeability of the calendered media is computed using CFD tools and reported for different compaction ratios. Results of our simulations are compared with the experiment as well as the available empirical and/or analytical permeability models in the literature and good agreement, depending upon the SVF, is observed. We also studied the influence of orientation distribution of the fibers on the dimensionless permeability of the fabric and noticed that permeability decreases by increasing the directionality of the fibers. This is found to be primarily due to the fact that highly oriented uncompressed fiber-webs tend to have a higher SVF. Fiber-webs of identical SVF, however, exhibited almost identical permeabilities regardless of their fiber orientations. DA - 2007/11// PY - 2007/11// DO - 10.1016/j.ces.2007.07.007 VL - 62 IS - 22 SP - 6285-6296 SN - 1873-4405 KW - fibrous materials KW - CFD KW - calendering KW - permeability KW - structural modeling ER - TY - JOUR TI - Effects of oxygen plasma treatment on adipose-derived human mesenchymal stem cell adherence to poly(L-lactic acid) scaffolds AU - Hanson, Ariel D. AU - Wall, Michelle E. AU - Pourdeyhimi, Behnam AU - Loboa, Elizabeth G. T2 - JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION AB - Plasma treatment of substrate surfaces can be utilized to improve adhesion of cells to tissue-engineered scaffolds. The purpose of this study was to enhance cell adhesion to non-woven poly(L-lactic acid) (PLLA) scaffolds using oxygen plasma treatment to increase surface hydroxyl groups and thereby enhance substrate hydrophilicity. It was hypothesized that oxygen plasma treatment would increase the number of adipose-derived human mesenchymal stem cells (hMSCs) that adhered to melt-blown, non-woven PLLA scaffolds without affecting cell viability. The number of cells that adhered to the oxygen plasma-treated (10 min at 100 W) or untreated PLLA scaffolds was assessed at 2, 4, 8, 12, 24 and 48 h post-seeding via DNA analysis. Cell viability and morphology were also assessed at 2, 4, 8, 12 and 24 h post-seeding via a live/dead assay and hematoxylin staining, respectively. Oxygen plasma treatment decreased the contact angle of water from 75.6 degrees to 58.2 degrees , indicating an increase in the surface hydrophilicity of PLLA. The results of the DNA analysis indicated that there was an increased number of hMSCs on oxygen plasma treated scaffolds for two of the three donors. In addition, oxygen plasma treatment promoted a more even distribution of hMSCs throughout the scaffold and enhanced cell spreading at earlier time points without altering cell viability. This early induction of cell spreading and the uniform distribution of cells, in turn, may increase future proliferation and differentiation of hMSCs under conditions that simulate the microenvironment in vivo. DA - 2007/11// PY - 2007/11// DO - 10.1163/156856207782246812 VL - 18 IS - 11 SP - 1387-1400 SN - 1568-5624 KW - hydrophilicity KW - non-woven PLLA scaffold KW - cell morphology KW - cell viability KW - melt-blown PLLA scaffold ER - TY - JOUR TI - On the pressure drop modeling of monofilament-woven fabrics AU - Wang, Q. AU - Maze, B. AU - Tafreshi, H. Vahedi AU - Pourdeyhimi, B. T2 - CHEMICAL ENGINEERING SCIENCE AB - Pressure drop of monofilament-woven fabrics is often calculated via the so-called orifice model in which a discharge coefficient is assigned to the weave's unit cell. In all previous models of woven fabrics, the filaments were assumed to have circular cross-sections—an assumption which is not entirely accurate especially when there is a considerable tension in the warps and wefts. Following the methodology developed by Lu et al. [1996. Fluid flow through basic weaves of monofilament filter cloth. Textile Research Journal 66 (5), 311–323], a new set of expressions are derived for calculating the most constricted open area, and so the discharge coefficient, of plain-woven monofilament fabrics having filaments with elliptical cross-sections. Conducting numerical simulations for computing the pressure drop of such fabrics, we observed a logarithmic relationship between the discharge coefficient and the Reynolds number. It was also shown that the discharge coefficient decreases by increasing the aspect ratio of the filaments’ cross-section. DA - 2007/9// PY - 2007/9// DO - 10.1016/j.ces.2007.06.001 VL - 62 IS - 17 SP - 4817-4821 SN - 1873-4405 KW - air permeability KW - monotilament fabrics KW - filament with elliptical cross-section KW - CFD ER - TY - JOUR TI - Geometrical modeling of fibrous materials under compression AU - Maze, Benoit AU - Tafreshi, Hooman Vahedi AU - Pourdeyhimi, Behnam T2 - JOURNAL OF APPLIED PHYSICS AB - Many fibrous materials such as nonwovens are consolidated via compaction rolls in a so-called calendering process. Hot rolls compress the fiber assembly and cause fiber-to-fiber bonding resulting in a strong yet porous structure. In this paper, we describe an algorithm for generating three dimensional virtual fiberwebs and simulating the geometrical changes that happen to the structure during the calendering process. Fibers are assumed to be continuous filaments with square cross sections lying randomly in the x or y direction. The fibers are assumed to be flexible to allow bending over one another during the compression process. Lateral displacement is not allowed during the compaction process. The algorithm also does not allow the fibers to interpenetrate or elongate and so the mass of the fibers is conserved. Bending of the fibers is modeled either by considering a constant “slope of bending” or constant “span of bending.” The influence of the bending parameters on the propagation of compression through the material’s thickness is discussed. In agreement with our experimental observations, it was found that the average solid volume fraction profile across the thickness becomes U shaped after the calendering. The application of these virtual structures in studying transport phenomena in fibrous materials is also demonstrated. DA - 2007/10/1/ PY - 2007/10/1/ DO - 10.1063/1.2794476 VL - 102 IS - 7 SP - SN - 1089-7550 ER - TY - JOUR TI - Unique-hue stimulus selection using Munsell color chips AU - Hinks, David AU - Cardenas, Lina M. AU - Kuehni, Rolf G. AU - Shamey, Renzo T2 - JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION AB - Presented are intra- and inter-observer variability data comparing the unique-hue (UH) selections of sets of males and females, using two different visual experimental procedures incorporating Munsell color chips of varying hue but identical chroma and value. Although 34 of the 40 Munsell hue chips were selected by at least one observer as a UH, selections were generally repeatable. In addition, intra-observer variability represented approximately 15% of inter-observer variability. Also, when only three consecutive Munsell chips were viewed at a time, females showed significantly larger intra-observer variability than males, especially when making unique green selections. However, variability in UH selections was statistically insignificant between males and females when all Munsell chips were viewed simultaneously. No correlation was found between UH selections or intra-observer variability and hue ordering ability. DA - 2007/10// PY - 2007/10// DO - 10.1364/JOSAA.24.003371 VL - 24 IS - 10 SP - 3371-3378 SN - 1084-7529 ER - TY - JOUR TI - Synthesis of Biocompatible CS-g-CMS ion exchangers and their adsorption Behavior for heavy metal ions AU - Song, S. H. AU - Yeom, B. Y. AU - Shim, W. S. AU - Hudson, S. M. AU - Hwang, T. S. T2 - Journal of Industrial and Engineering Chemistry DA - 2007/// PY - 2007/// VL - 13 IS - 6 SP - 1009-1016 ER - TY - JOUR TI - Simulating through-plane permeability of fibrous materials with different fiber lengths AU - Wang, Q. AU - Maze, B. AU - Tafreshi, H. Vahedi AU - Pourdeyhimi, B. T2 - MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING AB - Assuming that fibers can be represented as straight cylinders, an algorithm for generating virtual 3D layered fibrous media made up of fibers having identical diameters but different lengths is presented. It is shown that for a given basis weight and computational box (sample size), reducing the fiber length causes the solid volume fraction (SVF) to increase as the fibers pack next to one another more efficiently. The air permeability of these media is numerically simulated and discussed in detail with respect to the available 2D and 3D studies in the literature. Our permeability calculations show an excellent agreement with the predictions of the empirical equation of Davies [1] as well as the analytical model of Spielman and Goren [2]. Such an agreement indicates that, within the range of dimensions considered, the fiber length has no significant influence on the materials' through-plane permeability as long as the SVF remains constant. While this concept has been empirically observed in the past, our work is the first numerical simulation devised to confirm it. DA - 2007/12// PY - 2007/12// DO - 10.1088/0965-0393/15/8/003 VL - 15 IS - 8 SP - 855-868 SN - 0965-0393 ER - TY - JOUR TI - Efficient decolorization of dyebath wastewater using a novel cationic bleach activator/peroxide system AU - Saunders, P. AU - Hauser, P. AU - Hinks, D. T2 - AATCC Review DA - 2007/// PY - 2007/// VL - 7 IS - 10 SP - 34-38 ER - TY - PAT TI - Composite hydroentangling nozzle strip and method for producing nonwoven fabrics therewith AU - Dixon, M. D. AU - Lowder, J. T. AU - Pourdeyhimi, B. AU - Tafreshi, H. V. C2 - 2007/// DA - 2007/// PY - 2007/// ER - TY - JOUR TI - Joseph M. Juran, a perspective on past contributions and future impact AU - Godfrey, A. Blanton AU - Kenett, Ron S. T2 - QUALITY AND RELIABILITY ENGINEERING INTERNATIONAL AB - Abstract This paper combines presentations by the authors in a special session dedicated to the work of Joseph M. Juran at the sixth annual conference of the European Network for Business and Industrial Statistics in Wroclaw, Poland. The paper offers an historical perspective of the contributions of J. M. Juran to management science emphasizing aspects of cause and effect relationships and Integrated Models. Specifically, the paper presents the Juran concepts of Management Breakthrough, the Pareto Principle, the Juran Trilogy ® and Six Sigma. The impact of these contributions, put in an historical perspective of key thinkers who investigated cause and effect relationships, is then discussed. The impact of these contributions to modern Integrated Models is then assessed. Copyright © 2007 John Wiley & Sons, Ltd. DA - 2007/10// PY - 2007/10// DO - 10.1002/qre.861 VL - 23 IS - 6 SP - 653-663 SN - 1099-1638 KW - J. M. Juran KW - the Juran Trilogy((R)) KW - management breakthroughs KW - the pareto principle KW - six sigma KW - quality systems KW - integrated models KW - cause and effect relationships ER - TY - PAT TI - Cationic bleach activator with enhanced hydrolytic stability AU - Hauser, P. J. AU - Hinks, D. AU - Lee, J. J. AU - Lim, S.-H. C2 - 2007/// DA - 2007/// PY - 2007/// ER - TY - JOUR TI - Performance of a wavelet-based spectral procedure for steady-state simulation analysis AU - Lada, E. K. AU - Wilson, J. R. AU - Steiger, N. M. AU - Joines, J. A. T2 - INFORMS Journal on Computing AB - A summary and an analysis are given for an experimental performance evaluation of WASSP, an automated wavelet-based spectral method for constructing an approximate confidence interval on the steady-state mean of a simulation output process such that the delivered confidence interval satisfies user-specified requirements on absolute or relative precision as well as coverage probability. The experimentation involved three difficult test problems, each with an output process exhibiting some combination of the following characteristics: a long warm-up period, a persistent autocorrelation structure, or a highly nonnormal marginal distribution. These problems were used to compare the performance of WASSP with that of the Heidelberger-Welch algorithm and ASAP3, two sequential procedures based respectively on the methods of spectral analysis and nonoverlapping batch means. Concerning efficiency (required sample sizes) and robustness against the statistical anomalies commonly encountered in simulation studies, WASSP outperformed the Heidelberger-Welch procedure and compared favorably with ASAP3. DA - 2007/// PY - 2007/// DO - 10.1287/ijoc.1050.0161 VL - 19 IS - 2 SP - 150–160 KW - simulation KW - statistical analysis KW - spectral analysis KW - steady-state analysis KW - wavelet analysis ER - TY - JOUR TI - High strength nylon micro- and nanofiber based nonwovens via spunbonding AU - Fedorova, Nataliya AU - Pourdeyhimi, Behnam T2 - JOURNAL OF APPLIED POLYMER SCIENCE AB - Abstract In this study we explore the feasibility of using of islands‐in‐the‐sea (I/S) fibers in the spunbond process to produce relatively high strength micro‐ and nanofiber webs. The relationships between the number of islands, percent polymer composition, and the fiber and fabric properties are reported. Nylon 6 (N6) and poly (lactic) acid (PLA) were used as the islands and sea polymers, respectively. Micro‐ and nanofibers were obtained by dissolving PLA polymer from the final spunbond nonwovens. The fibers with 25% N6 showed a decrease in fiber diameter from 1.3 to 0.36 μm (micron) when the number of islands was increased from 36 to 360. The diameter of fibers with 75% N6 showed a decline from 2.3 to 0.5 μm for the same range. Hydroentangling was found to be the preferred method of bonding of the I/S structures; the bonded structures were able to withstand postprocessing steps required for dissolving of the sea from the resulting nonwovens. Hydroentanged micro‐ and nanofiber based nonwovens demonstrated high tensile and tear properties, which were insensitive to the N6 fiber size and its mechanical properties. Bonding efficiency and web uniformity were found to be dominant factors influencing the fabric performance. Overall, our study demonstrated that the I/S configuration is a promising technique for high speed and high throughput production of strong and light weight nonwovens comprised of micro‐ and nanofibers. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 2007 DA - 2007/6/5/ PY - 2007/6/5/ DO - 10.1002/app.25939 VL - 104 IS - 5 SP - 3434-3442 SN - 0021-8995 KW - nanofibers KW - nylon 6 KW - poly(lactic) acid KW - mechanical properties KW - spunbonding ER - TY - JOUR TI - A novel nozzle design for producing hydroentangled nonwoven materials with minimum jet-mark defects AU - Anantharamaiah, Nagendra AU - Roempert, Katharina AU - Tafreshi, Hooman Vahedi AU - Pourdeyhimi, Behnam T2 - JOURNAL OF MATERIALS SCIENCE DA - 2007/8// PY - 2007/8// DO - 10.1007/s10853-006-1164-7 VL - 42 IS - 15 SP - 6161-6170 SN - 1573-4803 ER - TY - JOUR TI - Planar ZnO ultraviolet modulator AU - Zhang, X. Y. AU - Dhawan, A. AU - Wellenius, P. AU - Suresh, A. AU - Muth, J. F. T2 - APPLIED PHYSICS LETTERS AB - A planar electroabsorption modulator suitable for spatial light modulation has been constructed. The device operates near the band edge of zinc oxide at 3.3eV and is based on broadening and shifting of the unconfined exciton with an externally applied electric field. The ZnO active layer was deposited on an aluminum/titanium oxide dielectric on an indium tin oxide conducting layer on glass. A transparent conductive InGaZnO layer on a spin on glass insulator served as the top contact, allowing high electric fields to be applied transverse to the ZnO layer. The modulator operates at room temperature in transmission mode with +45% modulation at 373nm and −18% modulation at 380nm at 140V applied bias, corresponding to ∼450kV∕cm electric field across the ZnO active layer. DA - 2007/8/13/ PY - 2007/8/13/ DO - 10.1063/1.2770995 VL - 91 IS - 7 SP - SN - 0003-6951 ER - TY - JOUR TI - Enhanced PAA bleaching of cotton by incorporating a cationic bleach activator AU - Lavric, Pavla Krizman AU - Kovac, Franci AU - Tavcer, Petra Forte AU - Hauser, Peter AU - Hinks, David T2 - COLORATION TECHNOLOGY AB - Peracetic acid is a well‐known alternative to hydrogen peroxide as a bleaching agent for cotton. In this study, a novel cationic bleach activator, N ‐[4‐(triethylammoniomethyl)benzoyl]butyrolactam chloride, was used in combination with peracetic acid to investigate the enhancement of cotton bleaching efficiency. The effects of temperature, pH and concentrations of activator and peracetic acid on the bleaching performance were studied using a statistical design of experiment. Adding activator to a peracetic acid bleaching bath improved the resultant whiteness of the substrate and at optimal conditions produced less fibre damage than when peracetic acid was used alone. In addition, the bleaching performance of both peracetic acid and hydrogen peroxide in the presence of activator was compared. In the absence of activator, the peracetic acid performance was considerably superior to a conventional hydrogen peroxide bleach system in which no bleach activator is present. However, addition of activator to the hydrogen peroxide bath increased the whiteness to a level comparable to peracetic acid. DA - 2007/// PY - 2007/// DO - 10.1111/j.1478-4408.2007.00088.x VL - 123 IS - 4 SP - 230-236 SN - 1478-4408 ER - TY - JOUR TI - A simulation of un-steady-state filtration via nanofiber media at reduced operating pressures AU - Maze, B. AU - Tafreshi, H. Vahedi AU - Wang, Q. AU - Pourdeyhimi, B. T2 - JOURNAL OF AEROSOL SCIENCE AB - In this work, 3-D structures resembling nanofiber (df<200nm) filter media are simulated and challenged with nanoparticle aerosols at reduced operating pressures. For the range of fiber diameters considered in this paper, the free molecular flow regime is dominant. Therefore, the disturbances to the air flow field caused by the fibers are neglected. Nanoparticle capture efficiency of nanofiber webs, due to Brownian diffusion and interception, is calculated for particle diameters ranging from 50 to 500 nm. Our simulations show that by decreasing the fiber diameter, the minimum collection efficiency of filtration media having identical pressure drops increases. This effect is accompanied by a decrease in the particle diameter associated with these minimum efficiencies—the most penetrating particle diameter. Moreover, it is demonstrated that increasing the flow temperature enhances the nanoparticle capture efficiency of nanofiber filters. Allowing the particles to deposit on the fibers as well as each other, the caking process of such nanofiber filters is simulated for different monodisperse and polydisperse aerosols at different temperatures. The statistical information regarding the composition of nanoparticle cakes formed at high and low temperatures is presented and discussed. DA - 2007/5// PY - 2007/5// DO - 10.1016/j.jaerosci.2007.03.008 VL - 38 IS - 5 SP - 550-571 SN - 1879-1964 KW - filtration KW - nanofiber KW - nanoparticle KW - caking KW - nonwoven filter KW - electrospinning ER - TY - JOUR TI - A simple expression for predicting the inlet roundness of micro-nozzles AU - Anantharamaiah, N. AU - Tafreshi, H. Vahedi AU - Pourdeyhimi, B. T2 - JOURNAL OF MICROMECHANICS AND MICROENGINEERING AB - The inlet roundness of micro-nozzles can directly influence properties of the liquid jets conducted through them. Obtaining accurate information regarding the inlet roundness of such tiny nozzles, however, is not easy. This is mainly due to the minute dimensions of these nozzles which render most nondestructive examination methods ineffective. In this study, a series of steady-state two-phase computational fluid dynamics simulations is performed to predict the inlet roundness of micro-nozzles used for producing constricted waterjets, i.e., waterjets resulting from a detached nozzle flow. Different micro-nozzles with inlet roundness ranging from r/d = 0 to 0.18 (where r and d are the inlet radius of curvature and the capillary diameter, respectively) were considered to obtain an expression for predicting the nozzle's inlet roundness as a function of its discharge coefficient. It is demonstrated that the discharge coefficient of nozzles conducting a detached flow increases with increasing inlet roundness. The inlet roundness predicted by our expression is in good agreement with the actual roundness determined by sectioning the nozzle and imaging its cross-section. Our expression is believed to be useful for manufacturers and users of capillary micro-nozzles for producing liquid micro-jets. DA - 2007/5// PY - 2007/5// DO - 10.1088/0960-1317/17/5/N01 VL - 17 IS - 5 SP - N31-N39 SN - 1361-6439 ER - TY - JOUR TI - Room temperature pulsed laser deposited indium gallium zinc oxide channel based transparent thin film transistors AU - Suresh, Arun AU - Wellenius, Patrick AU - Dhawan, Anuj AU - Muth, John T2 - APPLIED PHYSICS LETTERS AB - Indium gallium zinc oxide deposited by pulsed laser deposition at room temperature was used as a channel layer to fabricate transparent thin film transistors with good electrical characteristics: field effect mobility of 11cm2V−1s−1 and subthreshold voltage swing of 0.20V∕decade. By varying the oxygen partial pressure during deposition the conductivity of the channel was controlled to give a low off-current of ∼10pA and a drain current on/off ratio of ∼5×107. Changing the channel layer thickness was a viable way to vary the threshold voltage. The effect of the gate dielectric on the electrical behavior was also explored. DA - 2007/3/19/ PY - 2007/3/19/ DO - 10.1063/1.2716355 VL - 90 IS - 12 SP - SN - 0003-6951 ER - TY - JOUR TI - Porous organic-inorganic hybrid electrolytes for high-temperature proton exchange membrane fuel cells AU - Zhang, Xiangwu T2 - JOURNAL OF THE ELECTROCHEMICAL SOCIETY AB - A family of porous silica-based organic-inorganic hybrid electrolytes containing surface propanesulfonic acid groups or polystyrenesulfonic acid (PSS) chains for high-temperature proton exchange membrane fuel cells (PEMFCs) is described. Porous silica-propanesulfonic acid (porous silica-PS) has higher proton conductivity than the primary porous silica, but still has limited operating temperature and low water uptake at . Porous silica-polystyrenesulfonic acid (porous silica-PSS) has high proton conductivity, large water uptake, and improved operating temperature, which are influenced by the proton density on the inner surface of nanopores. A maximum conductivity of is achieved at a relative humidity of 40% and a temperature of for porous silica-PSS with a surface proton density of . The porous silica-PSS-based fuel cell has good cell performance at . DA - 2007/// PY - 2007/// DO - 10.1149/1.2429045 VL - 154 IS - 3 SP - B322-B326 SN - 1945-7111 UR - https://publons.com/publon/7178315/ ER - TY - JOUR TI - Decolorizing textile dye wastewater by anoxic/aerobic treatment AU - Smith, Brent AU - O'Neal, Gilbert AU - Boyter, Henry AU - Pisczek, Jamie T2 - JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY AB - Abstract A method of biologically decolorizing wastewater from fiber reactive dyeing of cotton by sequential anoxic/aerobic treatment steps using a single biomass has been developed and evaluated for chemical oxygen demand and color removal. A viable biomass that effectively removes both color and chemical oxygen demand in a sequential anoxic/aerobic treatment process has been developed. This method may be retrofitted to existing aerobic wastewater treatment systems that are typically used to treat dyeing wastewater. Copyright © 2006 Society of Chemical Industry DA - 2007/1// PY - 2007/1// DO - 10.1002/jctb.1629 VL - 82 IS - 1 SP - 16-24 SN - 0268-2575 KW - decolorization KW - azo dyes KW - wastewater treatment KW - anoxic KW - aerobic KW - textile dyeing ER -